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Vishay General Semiconductor - Diodes Division SMBJ45A-E3/52
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- Part No.:
- SMBJ45A-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45A-E3/52.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,524
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Product details
Overview
SMBJ45A-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection of DC power rails and signal lines. It features a 45 V stand-off voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, 72.7 V maximum clamping voltage (VC) at 8.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial motor drives, automotive body control modules, and industrial I/O interfaces.
For engineers reviewing the SMBJ45A-E3/52 datasheet, SMBJ45A-E3/52 pinout, SMBJ45A-E3/52 application, or SMBJ45A-E3/52 equivalent, key selection criteria include clamping performance under 8.3 ms surge, thermal resistance (RθJA = 100 °C/W), unidirectional polarity marking, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on SMB (DO-214AA) footprint.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 45 V, it avalanches to limit transient energy by diverting surge current to ground. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 µA at VWM), while the 100 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad design per Vishay's 0.2" × 0.2" (5.0 mm × 5.0 mm) recommendation.
The device sustains 100 A non-repetitive forward surge (8.3 ms half-sine) and exhibits 0.102 %/°C temperature coefficient of VBR, enabling predictable clamping across -55 °C to +150 °C operating range. It meets J-STD-020 MSL Level 1 and is rated for repetitive duty cycle ≤ 0.01 % at 600 W peak pulse power.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse working voltage before clamping initiates; sets upper limit for normal circuit operation. |
| VBR @ IT = 1 mA | 50.0–55.3 V - Breakdown threshold range; defines onset of avalanche conduction under standardized test current. |
| VC @ IPPM = 8.3 A | 72.7 V - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 600 W - Peak pulse power handling capability; validates protection against IEC 61000-4-5 Level 4 surges when properly mounted. |
| IFSM | 100 A - Single half-sine surge current rating (8.3 ms); supports protection against inductive switch-off transients in power electronics. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; mandates minimum 5.0 mm × 5.0 mm copper pad per terminal for safe 5.0 W steady-state dissipation. |
| Junction Temp Range | -55 °C to +150 °C - Full operational envelope; enables use in under-hood automotive and industrial environments. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band; anode and cathode terminals are axially aligned along the package body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode | Reference / ground return | Typically tied to system ground or low-impedance return path; completes shunt conduction loop during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates robustness against high-energy transients like ISO 7637-2 Pulse 5a without degradation. |
| 72.7 V clamping voltage at 8.3 A | Ensures downstream 48 V-rated components (e.g., CAN transceivers, microcontrollers) remain below absolute max ratings during surge. |
| MSL Level 1 moisture sensitivity | Enables direct placement without baking; supports high-yield reflow assembly in standard SMT lines. |
| Glass passivated junction | Delivers stable VBR tolerance and <1.0 µA leakage at VWM, critical for low-power sensor and battery-backed circuits. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets global environmental compliance requirements without halogen restrictions; suitable for consumer and industrial applications. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and MCU I/O against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and ground, clamping transients within 1 ns response time. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic interfaces exposed to >100 V switching spikes in factory automation systems. |
Use Scenario: Safeguarding LIN bus transceivers and door module microcontrollers from load dump and jump-start surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply rail, activated only during >45 V overvoltage events. Use Value: Maintains functional safety integrity by limiting rail voltage to 72.7 V during 12 V system transients up to 600 W peak. |
| Industrial Sensor Signal Lines | DC Power Input Protection |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in harsh plant environments. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 µA) unidirectional clamp on signal-to-ground path, preserving signal fidelity. Use Value: Enables reliable sub-µA bias current operation while surviving ±8 kV contact ESD per IEC 61000-4-2 without parameter shift. |
Use Scenario: Front-end surge suppression for 48 V DC input in telecom power supplies and PoE injectors. IC Role / Device Role / Timing Role: Primary clamping device on main input rail, coordinated with upstream fuses and MOVs. Use Value: Absorbs 600 W transient energy without failure, maintaining system uptime during lightning-induced surges on outdoor installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45A-M3/52 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package. | No difference in protection function; selected where halogen-free materials are mandated by OEM or regional regulations. | Choose SMBJ45A-M3/52 when compliance with JEDEC J-STD-202F (halogen content ≤ 900 ppm Cl/Br) is required. |
| SMCJ45A-E3/52 | Same VWM/VC but higher 1500 W PPPM; larger SMC (DO-214AB) package (7.11 mm × 6.22 mm vs. SMB's 4.57 mm × 3.94 mm). | Supports higher surge currents (22.5 A vs. 8.3 A) but requires larger PCB area and different thermal layout. | Select SMBJ45A-E3/52 for space-constrained designs needing 600 W protection; choose SMCJ45A-E3/52 only if >15 A surge margin is essential. |
Compared with SMBJ45A-M3/52, the E3/52 offers identical protection performance with standard RoHS compliance; versus SMCJ45A-E3/52, it trades 2.5× lower surge capacity for 40 % smaller footprint and lower thermal mass - optimizing for compact, cost-sensitive 48 V industrial interfaces.
Availability
SMBJ45A-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and DC power input protection requiring stable component supply, consistent RoHS compliance, and verified surge immunity per IEC 61000-4-5.
Supply support for SMBJ45A-E3/52 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, precision, and application-specific validation.
The SMBJ series is engineered for high-reliability transient suppression in automotive, industrial, and telecom systems - delivering repeatable clamping performance, low leakage, and robust surge endurance in compact surface-mount packages.
FAQ
What is the maximum clamping voltage of SMBJ45A-E3/52 under standard surge conditions?
The SMBJ45A-E3/52 has a maximum clamping voltage (VC) of 72.7 V when subjected to an 8.3 A peak pulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBJ45A-E3/52 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) with minimal drift due to its 0.102 %/°C VBR temperature coefficient.
Does SMBJ45A-E3/52 meet automotive qualification standards?
The SMBJ45A-E3/52 is a commercial-grade part (E3 suffix) and is not AEC-Q101 qualified. For automotive applications requiring AEC-Q101 certification, Vishay offers the SMBJ45AHE3_B/H variant (HE3 suffix). The SMBJ45A-E3/52 retains the same electrical characteristics and SMB package but lacks the extended reliability testing required for under-hood deployment. Engineers must select SMBJ45AHE3_B/H explicitly when designing to AEC-Q101 requirements.
What is the recommended PCB layout for optimal thermal performance of SMBJ45A-E3/52?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad for each terminal of the SMBJ45A-E3/52 to achieve the rated RθJA of 100 °C/W. These pads must be directly connected to internal or external ground/power planes via multiple thermal vias. The SMBJ45A-E3/52 datasheet Figure 2 shows derating curves confirming that junction temperature rise exceeds safe limits above 25 °C ambient without this copper area - making adherence to the pad layout mandatory for sustained 5.0 W power dissipation.
How does the unidirectional configuration of SMBJ45A-E3/52 affect its use in AC-coupled signal lines?
The SMBJ45A-E3/52 is unidirectional and therefore unsuitable for bidirectional signal lines such as USB, RS-485, or Ethernet without additional circuitry. Its cathode-band polarity means it only clamps positive transients relative to ground; negative excursions exceed its reverse standoff rating and may cause failure. For AC signals, engineers must use a bidirectional variant (e.g., SMBJ45CA) or back-to-back unidirectional diodes. The SMBJ45A-E3/52 is intended exclusively for DC rails and unidirectional I/O where polarity is fixed.
What is the surge current rating of SMBJ45A-E3/52 for non-repetitive events?
The SMBJ45A-E3/52 supports a non-repetitive peak forward surge current (IFSM) of 100 A for an 8.3 ms single half-sine waveform, per JEDEC standards. This rating applies only to unidirectional operation and assumes proper PCB thermal design. The device is not rated for repetitive surges above 0.01 % duty cycle at 600 W - repeated exposure beyond this limit risks parametric shift or catastrophic failure. Designers must verify system-level surge repetition rate against this limit when specifying SMBJ45A-E3/52.
SMBJ45A-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 8.3A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ45A-E3/52 FAQ
1.How can I place an order for SMBJ45A-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45A-E3/52 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMBJ45A-E3/52 reliable?
The price and inventory of SMBJ45A-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ45A-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ45A-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45A-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45A-E3/52?
SMBJ45A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45A-E3/52 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMBJ45A-E3/52?
For technical support, including SMBJ45A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45A-E3/52 requirements.
6.How does Aetrix verify that SMBJ45A-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ45A-E3/52 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMBJ45A-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ45A-E3/52?
All SMBJ45A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45A-E3/52, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMBJ45A-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ45A-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45A-E3/52 Tags
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